Method of making concealed slide fastener



A. J. MONAMARA 3,011,251

METHOD OF MAKING CONCEALED SLIDE FASTENER Filed May 31, 1960 Dec. 5,1961 INVENTOR. AMBROSE J. MO NAMARA "maw - ATTORNEY it .tates 3,011,251METHOD OF MAKING CONCEALED V SLIDE FASTENER Ambrose J. McNamara, WhitePlains, N.Y., assignor to Irving Constant, Esq., New York, N.Y. FiledMay 31, 1960, Ser. No. 32,802 5 Claims. (Cl. 29-408) This inventionrelates to a method of making a concealed slide fastener.

It has become increasingly popular in recent years to provide concealedslide fasteners on cloth members. The provision of a concealed slidefastener is desirable since it simulates a sewn seam in its closeddisposition. The fastener elements on the tapes of a concealed slidefastener are appreciably smaller than the fastener elements on aconventional slide fastener tape. Considerable difficulty has beenencountered in providing a diamond on the slider which has the requisitetolerances so that the fastener elements on the tapes mesh together atthe proper time. Thus, it has been found that a variance in .002 inch inthe diamond will render the slide fastener absolutely worthless. In theconventional slide fastener, the problem is only present to a smalldegree. However, with concealed slide fasteners and the smaller fastenerele- I merits, the problem is magnified.

Heretofore, it has been proposed to make the slider by die casting thesame with the diamond integral with the slider back. It has beenextremely difficult to maintain the requisite tolerances on the diamondwhen the slider is made in this fashion. Further, the slider has beenmade from a relatively soft material with the diamond integraltherewith. Thus, the tolerances achieved by die casting the slider aresoon lost due to the contact between the faces of the diamond and theheads of the fastener elements.

It is an object of the present invention to provide a method of making aconcealed slide fastener wherein the diamond is made from a materialharder than the material of the slider back and flanks.

It is another object of the present invention to provide a method ofmaking a concealed slide fastener capable of having the requisitetolerances on the diamond neces-' sary for effecting a meshing of thefastener elements on the slide fastener tapes.

Other objects will appear hereinafter.

For the purpose of illustrating the invention there is shown in thedrawings a form which is presently preferred; it being understood,however, that this invention is not limited to the precise arrangementsand the instrumentalities shown.

FEGURE 1 is a top plan view of one a slider of the present invention.

FKGURE 2 is a cross sectional view taken along the lines 2-2 in FIGURE1.

embodiment of 1 ear 20 on themating half 16. The size of the aperturesin the cars 18 and 20 are such that a pin 22 extends through theapertures while permitting the halves 14 and 16 to pivot relative to oneanother. The pin 22 extends into a blind hole 24 in the diamond 30.

The uppermost portions of the halves 14 and 16 are beveled to form ascarf half joint. The halves 14 and 16 are formed in the shape of wingsand are provided with respective side arms 26 and 28. The side arms 26and 28 are contoured so as to be substantial juxtaposed images of eachother.

The diamond 30- is carried on the inside face of the slider back 12. Thediamond 30 is provided with separating arms 32 and 34. As seen moreclearly in FIG- URE l, the separating arms 32 and 34 converge inwardlyfrom the uppermost portion of the diamond 30 to the apex 38. The sliderback 12 is divided along a center line 36 which bisects the apex 33 ofthe diamond 30. The edges of the halves 14 and 16 mate along the centerline 36.

The halves 14 and 16 are secured together by a locking clip 40. Each ofthe halves 14 and 16 are provided with a mating groove which extendsaround the periphery of the arms 26 and 28. The locking clip 40 isreceived within the grooves to hold the halves 14 and 16 in theirassembled disposition. The locking clip 40 may be pried loose from themating grooves to separate the halves l4 and '16 when the same isdesired.

A pull tab 42, shown in phantom in FIGURE 2, is received in an aperturein a lug 44. The lug 44 is inte gral with the diamond 30. As shown moreclearly in FIGURE 2, the diamond 30 is hatched differently from thehatching of the slider back plate 12 so as to indicate that the sliderback plate 12 is made from a metal different from the metal of thediamond 30. The diamond 30 is made from a metal which is substantiallyharder than the metal used for making the slider back plate 12 In thismanner, it is possible to obtain finer tolerances on the diamond and atthe same time provide a dimond which is made from a material harder thanthe material of the slider back plate 12.

Referring to FIGURES 3 and 4, there is shown a slider 10' havingsubstantially the same configuration as the slider 10. The elements ofslider 10' which are identical with the elements of the slider 10 areprimed. The slider back plate 12 is die cast as an integral back plate.

, The diamond 30' is is provided with an integral stud 46 FlGURE 3 is atop plan view of another embodiment of the slider of thepresentinvention.

FIGURE 4 is a cross sectional view taken along the lines 4-4 in FIGURE3.

FIGURE 5 is a cross sectional view of a concealed slide fastenerassembled to folded cloth members.

FIGURE 5 is a top plan view of a slide fastener.

Referring to the drawing in detail, wherein like numerals indicate likeelements, there is shown in FIGURE 1 a slider is. I

The slider '10 comprises a split back plate 12. The split back plate 12is comprised of mating halves 14 and 16. The mating halves 14 and 16 aresubstantial mirror images of each other except in their uppermostportions. Thus, the uppermost portion of the half 14 is provided with anofiset car 18 which mates with a similar offset g tapes 50 and 52.

depending downwardly from the body of the diamond The outer peripheralsurface of the stud 46 is grooved by knurling 48. The diamond 30' ismade from a material substantially harder than the slider back plate Thediamond 30 is made as a separate element and placed within the die moldfor the slider back plate 12..

The slider back plate 12 is cast about the diamond30'. The molten metalfor theslide back plate 12 enters the knurling 45 thereby providing arigid joint which decreases the possibility of the diamond 30 separatingfrom the slider back plate 12'.

The sliders 10and 10 are assernbled onto the fasteners The fastenertapes 50 and 52 are provided with fastener elements 54 along adjacentedges thereof as is conventional in the art. Since the slider 10comprises halves 14 and 16 which can pivot relative to the diamond 30,the slider 10 may be assembled onto the fastener tapes 50 and 52 afterthe tapes 50 and 52 have been joined by a bridging means. Also, theslider 10 may be present on the fastener tapes 50 and 52 prior to andduring the stitching of the fastener'tapes 50. and 52 terconnects thetape 52 and an inner ply of the cloth Patented Dec. 5, 1961 g 3 member56. The tape 50' is joined to an inner ply of the cloth member 58 by aline of stitching 62.

The slider may be assembled to the tapes 50 and 52, and the tapes 50 and52 may be stitched to the inner plies of the cloth members 56 and 58according to the method set forth in my copending application Serial No.761,094, filed September 15, 1958, for Method for Assembling SlideFastener to Cloth Article. The method disclosed in said copendingapplication is incorporated herewith by reference.

This application is a continuation in part of my copending applicationSerial No. 742,199, filed June 16, 195 8, for Slider, now Patent No.2,977,656 granted April 4, 1961.

The present invention may be embodied in other specific forms Withoutdeparting from the spirit or essential attributes thereof and,accordingly, reference should be made to the appended claims, ratherthan to the foregoing specification as indicating the scope of theinvention.

1 claim:

1. A method of making a slide fastener concealed by a cloth member whichcomprises making a diamond having separating arms from a relatively hardmaterial, making a slider back plate having flanks from a material whichis softer than the material of said diamond, then connecting only saidback plate and said diamond so as to form a slider, assembling saidslider to a pair of fastener tapes having fastener elements on adjacentedges, and sewing said tapes to a fold ply of a cloth member by a lineof stitching adjacent the fastener elements so as to conceal the tapesand slider.

2. A method of making a slide fastener in accordance with claim 1wherein said step of making the slider back plate and flanks includesthe step of die casting mating halves which form the back plate andflanks, providing an aperture in each of said halves, and said step ofconnecting the back plate to the diamond includes the step of providinga blind hole in said diamond and inserting a pin through said aperturesinto said blind hole.

3. A method of making a slide fastener in accordance with claim 1wherein said step of connecting the slider back plate having flanks tosaid diamond and said step of making a slider back plate and flanks aredone simultaneously by placing said diamond in the die mold for saidslider back plate and flanks, and die casting said back plate and flanksonly about a portion of said diamond which extends in a directionsubstantially perpendicular to the plane of said separating arms.

4. A method of making a slide fastener in accordance with claim 3including the step of roughening the surface of the portion of saiddiamond about which the slider back plate and flanks are cast so as toprovide a rigid joint thereby decreasing the possibility of said diamondseparating from said back plate.

5. A method of making a slide fastener comprising making a diamondhaving separating arms from a relatively hard material, making a pair ofidentical mating halves each having a flank from a material which issofter than the material of said diamond, providing an aperture adjacentone end in each of said halves, positioning said halves side by side inthe same plane, then connecting each of said halves to said diamond sothat said halves may be pivotable with respect to each other and saiddiamond, and then locking said halves together.

References fitted in the file of this patent UNITED STATES PATENTS1,919,455 Wilson July 25, 1933 2,155,795 Markin Apr. 25, 1939 2,320,566Carlile June 1, 1943 2,458,914 Morin Jan. 11, 1949 2,486,401 GerstmanNov. 1, 1949 2,526,653 Gerstman Oct. 24, 1950 2,697,227 Prupis Dec. 21,1954

